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Cs_(2)CO_(3)催化草酸二甲酯脱羰基合成碳酸二甲酯 被引量:3
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作者 黄谢君 刘俊涛 《工业催化》 CAS 2021年第12期71-74,共4页
研究了SiO_(2)载体负载Cs_(2)CO_(3)催化剂气相催化草酸二甲酯脱羰基合成碳酸二甲酯的反应。采用间歇高压搅拌釜考察了不同工艺条件下催化剂的反应性能,包括反应时间、反应温度、焙烧时间和负载量,并评价了最佳工艺条件下的催化剂寿命... 研究了SiO_(2)载体负载Cs_(2)CO_(3)催化剂气相催化草酸二甲酯脱羰基合成碳酸二甲酯的反应。采用间歇高压搅拌釜考察了不同工艺条件下催化剂的反应性能,包括反应时间、反应温度、焙烧时间和负载量,并评价了最佳工艺条件下的催化剂寿命。结果表明,在催化剂焙烧温度为500℃、负载量为10%、反应温度220℃和反应时间90 min的条件下,反应转化率和选择性达到最佳分别为73.1%和70.5%,单程收率为51.6%。在循环5次性能评价中,催化剂性能依次下降,为积碳所致,焙烧再生能恢复一定活性。 展开更多
关键词 精细化学工程 草酸二甲酯 脱羰基 碳酸二甲酯 碳酸铯
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Optimization Transmission Theory and Technical Pathways that Describe Multiscale Urban Agglomeration Spaces 被引量:17
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作者 FANG Chuanglin YANG Junyan +2 位作者 FANG Jiawen huang xiejun ZHOU Yi 《Chinese Geographical Science》 SCIE CSCD 2018年第4期543-554,共12页
Urban agglomerations are spatial entities that promote the development of ‘new urbanization' processes within China. In this context, the concept of ‘multiscale urban agglomeration spaces' encompasses three ... Urban agglomerations are spatial entities that promote the development of ‘new urbanization' processes within China. In this context, the concept of ‘multiscale urban agglomeration spaces' encompasses three linked levels: macroscale urban agglomerations, mesoscale cities, and microscale urban centers. Applying a series of multidisciplinary integrated research methods drawn from geography, urban planning, and architecture, this paper reveals two intensive utilization laws that can be generalized to apply to multiscale urban agglomeration spaces, top-to-bottom ‘positive transmission' linkage and inside-to-outside ‘negative transmission' movement. This paper also proposes optimization transmission theory and policy decision technical pathways that can be applied to these three urban agglomeration spatial scales. Specific technical pathways of transmission include intensive expansion and simulated decision-making in macroscale urban agglomerations, ecology, production, and living space intensive layout and dynamic decision-making in mesoscale cities, and four cores(i.e., ‘single, ring, axis, and pole core') progressive linkage and intensive optimization decision-making in microscale urban centers. The theory and technical pathways proposed in this paper solve the technical problem of optimization and provide intensive methods that can be applied not only at the individual level but also at multiple scales in urban agglomeration spaces. This study also advances a series of comprehensive technical solutions that can be applied to both compact and smart growth cities as well as to urban agglomerations. Solid theoretical support is provided for the optimization of Chinese land development, urbanization, agricultural development, and ecological security. 展开更多
关键词 urban agglomeration optimization transmission theory of multiscale urban spaces intensive space utilization technicalpathways
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