中南民族大学学报（自然科学版）
中南民族大學學報（自然科學版）
중남민족대학학보（자연과학판）
JOURNAL OF SOUTH-CENTRAL UNIVERSITY FOR NATIONALITIES(NATURAL SCIENCE EDITION)
2013年
2期
1-4
,共4页
费-托合成%低碳烯烃%SAPO-34%核-壳结构
費-託閤成%低碳烯烴%SAPO-34%覈-殼結構
비-탁합성%저탄희경%SAPO-34%핵-각결구
Fischer-Tropsch synthesis%light alkenes%SAPO-34%core-shell structure
采用水热法在 Co/Al2 O3球形催化剂外表面原位包裹了一层 SAPO-34分子筛膜，制备了具有核( Co/Al2O3)-壳(SAPO-34)结构的复合型催化剂。用X-射线衍射和扫描电镜对其结构进行了表征，并考察了其费-托合成直接制取低碳烯烃的反应性能。结果表明：此复合型催化剂外层的SAPO-34膜对核心Co/Al2 O3球形催化剂上的费-托合成反应提供了特殊的限域环境、孔道择型选择性和酸性，显著地改变了费-托合成产物分布，抑制了重质烃的生成，极大地提高了低碳烯烃的选择性。
採用水熱法在 Co/Al2 O3毬形催化劑外錶麵原位包裹瞭一層 SAPO-34分子篩膜，製備瞭具有覈( Co/Al2O3)-殼(SAPO-34)結構的複閤型催化劑。用X-射線衍射和掃描電鏡對其結構進行瞭錶徵，併攷察瞭其費-託閤成直接製取低碳烯烴的反應性能。結果錶明：此複閤型催化劑外層的SAPO-34膜對覈心Co/Al2 O3毬形催化劑上的費-託閤成反應提供瞭特殊的限域環境、孔道擇型選擇性和痠性，顯著地改變瞭費-託閤成產物分佈，抑製瞭重質烴的生成，極大地提高瞭低碳烯烴的選擇性。
채용수열법재 Co/Al2 O3구형최화제외표면원위포과료일층 SAPO-34분자사막，제비료구유핵( Co/Al2O3)-각(SAPO-34)결구적복합형최화제。용X-사선연사화소묘전경대기결구진행료표정，병고찰료기비-탁합성직접제취저탄희경적반응성능。결과표명：차복합형최화제외층적SAPO-34막대핵심Co/Al2 O3구형최화제상적비-탁합성반응제공료특수적한역배경、공도택형선택성화산성，현저지개변료비-탁합성산물분포，억제료중질경적생성，겁대지제고료저탄희경적선택성。
A well-designed zeolite capsule catalyst with a Core (Co/Al2O3)-Shell (SAPO-34) structure was prepared by zeolite shell growing via in situ hydrothermal method. XRD and SEM were used to investigate the structure of the capsule catalyst. The catalyst was used to directly synthesize light alkenes from syngas via Fischer-Tropsch synthesis ( FTS ) reaction. The cesults indicated that the core-shell structure provided a tailor-made confined reaction environment with spatially confined effect, shape selectivity of channels and acidity. Thus the distribution of products from FTS was altered, the formation of long-chain hydrocarbons was suppressed, and the selectivity of light alkenes was significantly improved.
