In this paper,the Ni/Al_(2)O_(3) monolithic catalyst with 15%Ni content was prepared using cordierite as a matrix,and the catalyst was modified with 10%NaOH to study the methanation performance of biomass gasification...In this paper,the Ni/Al_(2)O_(3) monolithic catalyst with 15%Ni content was prepared using cordierite as a matrix,and the catalyst was modified with 10%NaOH to study the methanation performance of biomass gasification simulated gas based on alkali-modified Ni/Al_(2)O_(3) monolithic catalyst.BET,TEM,H_(2)-TPR,XRD,CO_(2)-TPD and TG were used to characterize the physicochemical properties of the catalyst before and after modification.The results indicated that the CO conversion rate trends of unmodified and modified Ni/Al_(2)O_(3) monolithic catalysts over 2 h were fundamentally consistent.However,the Ni/Al_(2)O_(3) catalysts modified for 2 h demonstrated significantly enhanced performance compared to those modified for 1 h.Regarding CH4 selectivity,the modified Ni/Al_(2)O_(3) catalyst exhibited markedly better performance than the unmodified Ni/Al_(2)O_(3) catalyst,confirming the enhanced methane performance of the alkali-modified Ni/Al_(2)O_(3) monolithic catalyst.Under optimized conditions(H_(2)/CO volume ratio of 3∶1,space velocity of 10000 mL/(g·h),and temperature of 400℃),the methanation performance of the Ni/Al_(2)O_(3) monolithic catalyst modified for 2 h reached its peak,achieving a CO conversion rate of 97%with 100%CH4 selectivity.展开更多
This picture of "International Space Year" provided by Geo-Space Co. of Austria, which is obtained by geometric accurate correction and digital mounting on NOAA/AVHHR meteorological satellite image, displays...This picture of "International Space Year" provided by Geo-Space Co. of Austria, which is obtained by geometric accurate correction and digital mounting on NOAA/AVHHR meteorological satellite image, displays the vegetable rates of Europen Continent in detail. The snow-cover of the Alps, Scandinavia and Iceland and dry and hot features of Mediterranean area are very clear. The vegetable rates give multi-temporal information for the study of environmental and seasonal change, biomass estimation and crop production, which has been the展开更多
Based on Landsat image received by the Remote Sensing Ground Station of Chinese Academy of Sciences on Feb. 23, 1988, the image is obtained by geometric accurate-correction and flase-colour composition. The ancient wa...Based on Landsat image received by the Remote Sensing Ground Station of Chinese Academy of Sciences on Feb. 23, 1988, the image is obtained by geometric accurate-correction and flase-colour composition. The ancient way of fresh-water stream, bridge, block, railway, highway can be easily distinguished.展开更多
The Dunhuang Liwen is the literature record of Dunhuang social economy and financial affairs. It is mostly seen in the classical documents of Tang and Song Dynasty. It is the valuable corpus in the study of Chinese hi...The Dunhuang Liwen is the literature record of Dunhuang social economy and financial affairs. It is mostly seen in the classical documents of Tang and Song Dynasty. It is the valuable corpus in the study of Chinese history, especially the study of ancient Chinese vocabulary.Now five vernacular words are selected under study in this paper so that some wrong explanations can be corrected.展开更多
基金Supported by the National Natural Science Foundation of China(52506188,52476215)Natural Science Foundation of Liaoning Province(2024-MS-139,2024JH3/10200047)Scientific Research Program of Department of Education of Liaoning Province(310125042,LJ212410143033)。
文摘In this paper,the Ni/Al_(2)O_(3) monolithic catalyst with 15%Ni content was prepared using cordierite as a matrix,and the catalyst was modified with 10%NaOH to study the methanation performance of biomass gasification simulated gas based on alkali-modified Ni/Al_(2)O_(3) monolithic catalyst.BET,TEM,H_(2)-TPR,XRD,CO_(2)-TPD and TG were used to characterize the physicochemical properties of the catalyst before and after modification.The results indicated that the CO conversion rate trends of unmodified and modified Ni/Al_(2)O_(3) monolithic catalysts over 2 h were fundamentally consistent.However,the Ni/Al_(2)O_(3) catalysts modified for 2 h demonstrated significantly enhanced performance compared to those modified for 1 h.Regarding CH4 selectivity,the modified Ni/Al_(2)O_(3) catalyst exhibited markedly better performance than the unmodified Ni/Al_(2)O_(3) catalyst,confirming the enhanced methane performance of the alkali-modified Ni/Al_(2)O_(3) monolithic catalyst.Under optimized conditions(H_(2)/CO volume ratio of 3∶1,space velocity of 10000 mL/(g·h),and temperature of 400℃),the methanation performance of the Ni/Al_(2)O_(3) monolithic catalyst modified for 2 h reached its peak,achieving a CO conversion rate of 97%with 100%CH4 selectivity.
文摘This picture of "International Space Year" provided by Geo-Space Co. of Austria, which is obtained by geometric accurate correction and digital mounting on NOAA/AVHHR meteorological satellite image, displays the vegetable rates of Europen Continent in detail. The snow-cover of the Alps, Scandinavia and Iceland and dry and hot features of Mediterranean area are very clear. The vegetable rates give multi-temporal information for the study of environmental and seasonal change, biomass estimation and crop production, which has been the
文摘Based on Landsat image received by the Remote Sensing Ground Station of Chinese Academy of Sciences on Feb. 23, 1988, the image is obtained by geometric accurate-correction and flase-colour composition. The ancient way of fresh-water stream, bridge, block, railway, highway can be easily distinguished.
基金This paper is the staged achievement of the Humanities and Social Science Youth Fund Project of Ministry of Education(No.13 YJC740129)-Study on Vernacular Words in the Dunhuang Liwenthe Humanities and Social Science Fund Key Project of Henan Education Department(No.2013-ZD-108)
文摘The Dunhuang Liwen is the literature record of Dunhuang social economy and financial affairs. It is mostly seen in the classical documents of Tang and Song Dynasty. It is the valuable corpus in the study of Chinese history, especially the study of ancient Chinese vocabulary.Now five vernacular words are selected under study in this paper so that some wrong explanations can be corrected.
