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| 1 | Modification of CaO-based sorbents prepared from calcium acetate for CO_2 capture at high temperature显示文摘CaO-based sorbent is considered to be a promising candidate for capturing CO_2 at high temperature. However,the adsorption capacity of CaO decreases sharply with the increase of the carbonation/calcination cycles. In this study, CaO was derived from calcium acetate(CaAc_2), which was doped with different elements(Mg, Al,Ce, Zr and La) to improve the cyclic stability. The carbonation conversion and cyclic stability of sorbents were tested by thermogravimetric analyzer(TGA). The sorbents were characterized by N_2 isothermal adsorption measurements, scanning electron microscopy(SEM) and X-ray diffraction(XRD). The results showed that the cyclic stabilities of all modified sorbents were improved by doping elements, while the carbonation conversions of sorbents in the 1st cycle were not increased by doping different elements. After 22 cycles, the cyclic stabilities of CaO–Al, CaO–Ce and CaO–La were above 96.2%. After 110 cycles, the cyclic stability of CaO–Al was still as high as 87.1%. Furthermore, the carbonation conversion was closely related to the critical time and specific surface area. | Xiaotong Liu Junfei Shi Liu He Xiaoxun Ma Shisen Xu | 2017 | Chinese Journal of Chemical Engineering2017，25，5： | 7 |
| 2 | Co-pyrolysis of bituminous coal and biomass in a pressured fluidized bed显示文摘An experimental study on co-pyrolysis of bituminous coal and biomass was performed in a pressured fluidized bed reactor.The blend ratio of biomass in the mixture was varied between 0 and 100 wt%,and the temperature was over a range of 550–650℃ under 1.0 MPa pressure with different atmospheres.On the basis of the individual pyrolysis behavior of bituminous coal and biomass,the influences of the biomass blending ratio,temperature,pressure and atmosphere on the product distribution were investigated.The results indicated that there existed a synergetic effect in the co-pyrolysis of bituminous coal and biomass in this pressured fluidized bed reactor,especially when the condition of bituminous coal and biomass blend ratio of 70:30(w/w),600℃,and 0.3 MPa was applied.The addition of biomass influenced the tar and char yields and gas and tar composition during co-pyrolysis.The tar yields were higher than the calculated values from individual pyrolysis of each fuel,and consequently the char yields were lower.The experimental results showed that the composition of the gaseous products was not in accordance with those of their individual fuel.The improvement of composition in tar also indicated synergistic effect in the co-pyrolysis. | Yong Huang Ningbo Wang Qiaoxia Liu Wusheng Wang Xiaoxun Ma | 2019 | Chinese Journal of Chemical Engineering2019，27，7： | 7 |
| 3 | Development of a CH4 dehydroaromatization–catalyst regeneration fluidized bed system显示文摘A pilot-scale methane dehydroaromatization–H_2regeneration fluidized bed system(MDARS)was developed.In the MDARS,the catalyst circulation between a fluidized bed reactor and a fluidized bed regenerator with the help of a catalyst feeder allowed methane dehydroaromatization(MDA)and H_2regeneration to be carried out simultaneously,which is good for maintaining a stable MDA catalytic activity.A fixed bed reactor(FB)and a single fluidized bed reactor(SFB)were also used for a comparative study.The experimental results showed that the catalytic activity in the MDARS was more stable than that in the FB and SFB reactors.The effects of some parameters of MDARS on the CH_4conversion and product selectivity were investigated.To verify the feasibility and reliability of the MDARS,an eight-hour long-term test was carried out,which demonstrated that the operation of the MDARS was stable and that the catalytic activity remained stable throughout the entire experimental period. | Peng Yan Zhanguo Zhang Dapeng Li Xu Cheng Xinzhuang Zhang Fan Yang Chuanfeng Huang Xiaoxun Ma | 2018 | Chinese Journal of Chemical Engineering2018，26，9： | 5 |
| 4 | Selective catalytic hydrogenation of naphthalene to tetralin over a NiMo/Al2O3 catalyst显示文摘The selective catalytic hydrogenation of naphthalene to high-value tetralin was systematically investigated.A series of Al2O3 catalysts containing different active metals(Co,Mo,Ni,W)were prepared by incipient wetness impregnation.The effects of different active metals forms(oxidation,reduction,sulfuration)and reaction conditions on naphthalene hydrogenation were investigated and the catalysts were characterized by XRD,XPS,BET,NH3-TPD and SEM.Especially,Ni-Mo/Al2O3 was first used in this reactive system.The results show that the oxidative4%Ni O-20%MoO3/Al2O3 is the best catalyst for the preparation of tetralin.The conversion of naphthalene and the selectivity of tetralin can reach 95.62%and 99.75%respectively at 200℃,8 h and 6 MPa.Compared with reduced and sulfureted 4%Ni O-20%MoO3/Al2O3 catalysts,oxidative 4%Ni O-20%MoO3/Al2O3 has a well dispersed and uniform monolayer of the active metals,larger pore volume and size,and larger total acidity.NiO-MoO3/Al2O3 has a synergistic effect between NiO activity and MoO3 selectivity. | Xiaoping Su Pu An Junwen Gao RuchengWang Yujuan Zhang Xi Li Yangkun Zhao Yongqi Liu Xiaoxun Ma Ming Sun | 2020 | Chinese Journal of Chemical Engineering2020，28，10： | 4 |
| 5 | A study on simultaneous removal of NO and SO2 by using sodium persulfate aqueous scrubbing显示文摘Nitric oxide(NO) removal and sulfur dioxide(SO_2) removal by sodium persulfate(Na_2S_2O_8) were studied in a Bubble Column Reactor. The proposed reaction pathways of NO and SO_2 removal are discussed. The effects of temperatures(35–90 °C), Na_2S_2O_8(0.05–0.5 mol·L^(-1)), Fe SO4(0.5–5.0 m mol·L^(-1)) and H_2O_2(0.25 mol·L^(-1))on NO and SO_2 removal were investigated. The results indicated that increased persulfate concentration led to increase in NO removal at various temperatures. SO_2 was almost completely removed in the temperature range of 55–85 °C. Fe^(2+)accelerated persulfate activation and enhanced NO removal efficiency. At 0.2 mol·L^(-1) Na_2S_2O_8 and 0.5–1.0 mmol·L^(-1) Fe^(2+), NO removal of 93.5%–99% was obtained at 75–90 °C, SO_2 removal was higher than 99% at all temperatures. The addition of 0.25 mol·L^(-1) H_2O_2 into 0.2 mol·L^(-1) Na_2S_2O_8 solution promoted NO removal efficiency apparently until utterly decomposition of H2 O2, the SO_2 removal was as high as98.4% separately at 35 °C and 80 °C. | Xue Kang Xiaoxun Ma Jian'an Yin Xuchun Gao | 2018 | Chinese Journal of Chemical Engineering2018，26，7： | 3 |
| 6 | Catalytic performance of imidazole modified HZSM-5 for methanol to aromatics reaction显示文摘A facile approach was developed for the preparation of nano-sized HZSM-5 with a hierarchical mesoporous structure by adding imidazole into conventional zeolite synthesis precursor solution. The physicochemical properties of modified HZSM-5 were characterized by X-ray diffraction(XRD), N_2 adsorption–desorption isotherms, scanning electron microscopy(SEM), NH_3-temperature-programmed desorption(NH_3-TPD) and pyridine adsorption infrared spectroscopy(Py-IR). The coke in spent catalysts was characterized by thermogravimetry(TG). The results showed that hierarchical HZSM-5 zeolites with excellent textural properties, such as abundant porous structure, uniform particle size and suitable acidity, could be synthesized by the recipe of one-pot synthesis routes. Moreover, the obtained HZSM-5 exhibited higher selectivity of total aromatics as well as longer lifetime in the catalytic conversion of methanol to aromatics, comparing with conventional HZSM-5. It is expected that the synthesis approach demonstrated here will be applicable to other zeolites with particular textural properties and controllable particle sizes, facilitating the emergence of new-type porous materials and their related applications in catalysis and separation. | Haifeng Tian Zhuangzhuang Zhang Hui Chang Xiaoxun Ma | 2017 | Journal of Energy Chemistry2017，26，3： | 2 |
| 7 | Selective preparation of light aromatic hydrocarbons from catalytic fast pyrolysis vapors of coal tar asphaltene over transition metal ion modified zeolites显示文摘The catalytic cracking of coal tar asphaltene(CTA)pyrolysis vapors was carried out over transition metalion modified zeolites to promote the generation of light aromatic hydrocarbons(L-ArHs)in a pyrolysisgas chromatography/mass spectrometry(Py-GC/MS)micro-reactor system.The effects of ultra stable Y(USY),Co/USY and Mo/USY on the selectivity and yield of L-ArHs products and the extent of deoxygenation(Edeoxygenation),lightweight(Elightweight)from CTA pyrolysis volatiles were investigated.Results showed that the yields of L-ArHs are mainly controlled by the acid sites and specific surface area of the catalysts,while the deoxygenation effect is determined by theirs pore size.The Eligltweight of CTA pyrolysis volatiles over USY is 9.65%,while the Edeoxygenation of CTA pyrolysis volatiles over Mo/USY reaches 20.85%.Additionally,the modified zeolites(Mo/USY and Co/USY)exhibit better performance than USY on L-ArHs production,owing to the synergistic effect of metal ions(Mo,Co)and acid sites of USY.Compared with the non-catalytic fast pyrolysis of CTA,the total yield of L-ArHs obtained over USY(4032 mg·kg^(-1)),Co/USY(4363 mg·kg^(-1))and Mo/USY(4953 mg·kg^(-1))were increased by 27.03%,38.19%and 54.78%,respectively.Furthermore,the possible catalytic conversion mechanism of transition metal ion(Co and Mo)modified zeolites was proposed based on the distribution of products and the characterizations of catalysts. | Yongqi Liu Qiuxiang Yao Ming Sun Xiaoxun Ma | 2021 | Chinese Journal of Chemical Engineering2021，34，7： | 2 |
| 8 | Efficient conversion of benzene and syngas to toluene and xylene over ZnO-ZrO_(2)&H-ZSM-5 bifunctional catalysts显示文摘A series of ZnO-ZrO_(2) solid solutions with different Zn contents were synthesized by the urea coprecipitation method,which were coupled with H-ZSM-5 zeolite to form bifunctional catalysts.As a new benzene alkylation reagent,syngas was used instead of methanol to realize the efficient conversion of syngas and benzene into toluene and xylene.A suitable ratio of ZnO-ZrO_(2) led to the significant improvement in the catalytic performance,and a suitable amount of acid helped to increase the selectivity of toluene/xylene and reduce the selectivity of the by-products ethylbenzene and C^(9+) aromatics.The highest benzene conversion of 89.2%and toluene/xylene selectivity of 88.7%were achieved over 10%ZnO-ZrO_(2)&H-ZSM-5(Si/Al=23)at a pressure of 3 MPa and a temperature of 450℃.In addition,the effect of the zeolite framework structure on product distribution was examined.Similar to the molecular dynamics of aromatic hydrocarbons,H-ZSM-5 zeolites comprise 10-membered-ring pores,which are beneficial to the activation of benzene;hence,the conversion of benzene is higher.H-ZSM-35 and HMOR zeolites exhibited small eight-membered-ring channels,which were not conducive to the passage of benzene;hence,the by-product ethylbenzene exhibits a higher selectivity.The distance between the active centers of the bifunctional catalysts was the main factor affecting the catalytic performance,and the powder mixing method was more conducive to the conversion of syngas and benzene. | Xiao Zhao Xuan Shi Zhongshun Chen Long Xu Chengyi Dai Yazhou Zhang Xinwen Guo Dongyuan Yang Xiaoxun Ma | 2022 | Chinese Journal of Chemical Engineering2022，35，5： | 2 |
| 9 | Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles显示文摘In the present work,the effect of pre-calcination on carbonation conversion and cyclic stability of modi fied CaObased sorbent was investigated by thermogravimetric analyzer(TGA).The modi fied CaO-based sorbents with CaAc_2 as precursor were respectively doped with different elements(Mg,Al,Ce,Zr and La).The speci fic surface area,pore volume and pore size distribution were tested by N_2 isothermal adsorption measurements.The phase compositions of sorbents were characterized by X-ray diffraction(XRD).The results showed that the cyclic stabilities of the sorbents were improved by pre-calcination.The pre-calcination was conducted at 900°C for 5 h in air by the muf fle furnace.With pre-calcination,the cyclic stabilities of sorbents could be as high as 96% after 22 cycles,such as CaO-Al,CaO-Ce and CaO-La.After contact with air,the carbonation conversions of spent sorbents with pre-calcination suddenly increased by about one-sixth due to the change of channel structure by hydration.Both the cyclic stability of sorbent and the durability of reactivation were related to the structural stability of sample,especially the stability of mesopores between 2 nm and 5.5 nm.The present work also provided an easy and low-cost method for reactivating the spent CaO-based sorbents. | Xiaotong Liu Xiaoxun Ma Liu He Shisen Xu | 2017 | Chinese Journal of Chemical Engineering2017，25，10： | 2 |
| 10 | Use of limestone for SO2 removal from flue gas in the semidry FGD process with a powder-particle spouted bed显示文摘 | Xiaoxun Ma Kaneko Takao Tashimo Tsutomu | 2000 | Chemical Engineering Science2000，55，20： | 1 |
| 11 | Removal of SO2 from flue gas using a new semidry flue gas desulfurization process with a powder-parti- cle spouted bed显示文摘 | Ma Xiaoxun Kaneko Takao Guo Qimin | 1999 | Canadian Journal of Chemical En- gineering1999，77，2： | 1 |
| 12 | Stress analysis and failure mechanism of H13 steel hot-forging die for automobile engine crankshaft 显示文摘 | Zhang Xiaoxun Ma Chiying Sun Yunhua | 2012 | Applied Me- chanics and Materials2012，2，： | 1 |
| 13 | Controlled direct synthesis of single- to multiple-layer MWW zeolite显示文摘The minimized diffusion limitation and completely exposed strong acid sites of the ultrathin zeolites make it an industrially important catalyst especially for converting bulky molecules.However,the structure-controlled and large-scale synthesis of the material is still a challenge.In this work,the direct synthesis of the single-layer MWW zeolite was demonstrated by using hexamethyleneimine and amphiphilic organosilane as structure-directing agents.Characterization results confirmed the formation of the single-layer MWW zeolite with high crystallinity and excellent thermal/hydrothermal stability.The formation mechanism was rigorously revealed as the balanced rates between the nucleation/growth of the MWW nanocrystals and the incorporation of the organosilane into the MWW unit cell,which is further supported by the formation of MWW nanosheets with tunable thickness via simply changing synthesis conditions.The commercially available reagents,well-controlled structure and the high catalytic stability for the alkylation of benzene with 1-dodecene make it an industrially important catalyst. | Jie-Qiong Chen Yu-Zhao Li Qing-Qing Hao Huiyong Chen Zhao-Tie Liu Chengyi Dai Jianbo Zhang Xiaoxun Ma Zhong-Wen Liu | 2021 | National Science Review2021，8，7： | 1 |
| 14 | Kinetics of rapid coal devolatilizatiou measured using a spot heater apparatus 显示文摘 | XIAOXUN MA HIROSHI N TADASHI Y | 2003 | Fuel Processing Technology2003，85，： | 1 |
| 15 | Gradient Separation of 300 C Distillate from Low-temperature Coal Tar Based on Formaldehyde Reactions显示文摘 | SUN Ming MA Xiaoxun LU Bo | 2015 | Fuel2015，160，： | 1 |
| 16 | Oxidative absorption of NO by sodium persulfate coupled with Fe2~ , Fe304, and H202 显示文摘 | Gao Xuchun Ma Xiaoxun Kang Xue | 2015 | Environmental Progress and Sustainable Energy2015，34，1： | 1 |
| 17 | GC-MS and TG-FTIR Study of Petroleum Ether and Residue from Low Temperature Coal Tar显示文摘 | SUN Ming MA Xiaoxun YAO Qiuxiang | 2011 | Energy and Fuels2011，25，3： | 1 |
| 18 | Removal of SO2 from Flue Gas Using a New Semidry Flue Gas Desulfurization Process with a Powder-Particle Spouted Bed 显示文摘 | MA XIAOXUN KANEKO TAKAO GUO QIMIN | 1999 | Canadian Journal of Chemical Engineering1999，77，2： | 1 |
| 19 | 显示文摘 | Ma Xiaoxun Takao Kaneko Tsutomu Tashimo | 2000 | Japan:Chemical Engineering Science2000，，55： | 1 |
| 20 | 显示文摘 | Liu Yunyi Ma Xiaoxun Kunio Kato | 2001 | Journal of Shenyang Institute of Chemical Technology2001，15，1： | 1 |
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