渣油催化临氢热转化钼铁双金属催化剂的研究

Replacement of precious single metal catalysts with cost-effective, highly-dispersed composite catalysts for catalytic hydrothermal conversion of residue holds tremendous promise for the residue upgrading technologies. Organic metals were added to the feed as the oil-soluble precursors, and transformed into the catalytic active phases in this work. Physical properties and structures of the composite catalysts had been investigated by X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscope and transmission electron microscopy. The composite catalysts were found to be highly efficient in the catalytic hydrothermal conversion of both model compound and residue. Increased metal dispersion and synergistic effects of two metals played indispensable roles in such catalytic system. Results showed that under the test conditions in the article, the catalyst had the best catalytic performance when the mass ratio of molybdenum to iron was 1.5.     

浆态床油溶性加氢催化剂前体的研究进展

浆态床渣油加氢工艺是加工劣质油品的有效方法，由于原料具有高沥青质、高金属含量的特点，工艺的核心在于提供稳定高效的加氢裂化催化剂。油溶性催化剂前体能够原位转化为纳米级尺寸的催化剂活性相，其分散度高、加氢活性高，因而成为浆态床渣油加氢工艺的首选。本文主要介绍了4类常见的油溶性有机钼化合物，即二烷基(芳基)二硫代氨基甲酸钼(Mo-DTC)和二烷基二硫代磷酸钼（Mo-DTP）、环烷酸钼（MoNaph）、异辛酸钼、六羰基钼，比较它们在氢气和硫作用下的转化过程以及对重质原料的加氢性能，找出各自在应用过程中的优缺点，为深入研究和设计开发油溶性催化剂前体提供思路和借鉴。     

文化植入的城市绿道规划策略研究——以洪湖绿道为例

作为城市绿地系统、景观系统及慢行系统的重要组成部分,绿道也是创新与传承文化的重要载体。近些年的城市绿道建设大多文化特色不足、功能单一。该文基于洪湖绿道项目,以文化植入为出发点,挖掘绿道规划设计过程中的文化特性,探寻文化要素在城市绿道规划中的表达途径,以充分发挥绿道在生态景观、绿色出行及户外休闲等方面的作用。