Effect of Ag loading on soot oxidation for Ag/Ce_(0.75)Zr_(0.25)O_2 catalysts

开发低温下高催化活性的柴油机碳烟颗粒燃烧催化剂是当前环境催化领域的热点问题。利用共沉淀的方法制备了用于碳烟催化燃烧反应的Ag/Ce_(0.75); Zr_(0.25)O_2催化剂。活性评价结果表明,相对于Ce_(0.75)Zr_(0.25)O_2催化剂,Ag的引入可显著降低碳烟催化燃烧温度。; 而且,Ag的负载量存在一个最佳值。以XRD、in-situ; XRD、BET、TPR等表征手段探究了该系列催化剂结构性质及其变化产生的影响。结果表明,Ag与Ce物种间的相互作用可显著降低催化剂(特别是CeO; _2表面氧)的还原温度。该相互作用使Ag/Ce_(0.75)Zr_(0.25)O_2催化剂在一定温度下(>200℃)就表现出Ag+的性质。这些性; 质与该催化剂具有较高的碳烟氧化活性相关。而且,该催化剂也表现出良好的稳定性。It is still important to develop soot oxidation catalysts with excellent; activity under low temperature. Ag/Ce_(0.75)Zr_(0.25)O_2 was synthesized; via coprecipitation method for soot oxidation. Compared with the; catalytic performance of Ce_(0.75)Zr_(0.25)O_2, the introduction of Ag; can lead to the decrease of soot-ignition temperature. Moreover, there; is an optimal Ag loading. Subsequently, several methods such as XRD,; in-situ XRD, BET, TPR were used to characterize the physicochemical; properties of Ag-based catalysts. The results showed that the; introduction of Ag resulted in decreasing the reduction temperature of; surface oxygen species, being due to the interaction of Ag and Ce. The; interaction also brings about the occurrence of Ag~+ nature. And the; feature is linked with the outstanding activity of soot oxidation for; Ag-based catalyst. Furthermore, the Ag-based catalyst possessed fairly; good stability in soot oxidation.国家自然科学基金项目; 中央高校基本科研业务费专项资金项

Kilogram Scale-up Preparation of Catalysts and its Reaction Process in Syngas Methanation

甲烷化催化剂是煤制合成天然气核心技术之一,因此研发合成气完全甲烷化催化剂具有重要意义。研究工作采用实验室小试共沉淀制备甲烷化催化剂的最佳工艺条件; 方法,进行单批次1、5和10; kg级(代号cat-1、cat-5、cat-10)催化剂的制备研究。研究了催化剂制备的控制因素和放大制备催化剂的反应性能及催化反应工艺条件。研究; 显示:催化剂制备的控制因素主要包括Na~+含量及晶型结构;放大制备催化剂具有良好的活性、操作稳定性和耐热性能,与小试制备催化剂具有较好的一致性;; 放大制备催化剂(cat-10)在所考察的还原温度、反应H_2/CO比和10000~40000; mL·h~(-1)*g_(cat)~(-1)反应空速范围内具有良好的甲烷化活性。研究结果表明,该研究单批次公斤级催化剂放大制备是成功的,为实现催; 化剂进一步放大制备提供了良好基础。Methanation catalysts play a vital role in the production of synthetic; natural gas (SNG) from coal. Based on bench-scale optimum; co-precipitation conditions of catalyst preparation, scale up; preparation of catalysts for syngas methanation with single batch of 1,; 5 and 10 kg is studied. Factors affecting catalyst; preparation/performance and scale-up were investigated. The results show; that Na~+ content and crystal structure of the catalysts are the; critical factors, and the catalysts prepared under scale-up conditions; possess excellent operation stability and heat resistance, with; consistent performance as those from bench-scale samples. The 10 kg; batch has good reaction activity under studied conditions. Therefore,; the scale-up preparation is successful for the methanation catalyst in; this study, which is useful for future scale-up preparation of related; catalysts

一种调查水库鱼类资源的抬网装置

一种调查水库鱼类资源的抬网装置，包括一方形的渔网，在渔网的四个边角上分别设有一根拉网绳，在每根拉网绳的附近都安置有一根支撑杆，在支撑杆上安装有上滑轮和定线环，在其中一侧的两根支撑杆上还设有下滑轮，所述拉网绳位于定线环内，在支撑杆的一侧还安置有收线轮，所述收线轮具有一个直径较大的大滚柱和一个直径较小的小滚柱，在收线轮的端面上还安装有把手，在收线轮的下方设有支撑架，所述收线轮轴连接在支撑架内，本实用新型可以主动将鱼捕捉起来后，选择性的对鱼进行研究，不会让鱼在网内停留过长时间，而且本实用新型操作简单，省时省力，不会给鱼带来额外的伤害。</p

1,4-丁炔二醇温和条件下PdNi基加氢催化剂的研究

鉴于丁炔二醇加氢制丁二醇的生产工艺一般涉及高压/高温,以α-Al2O3或碳纳米管（CNTs）为载体,研发了近室温近常压下1,4-丁炔二醇的Pd（Ni）基催化剂的加氢性能及其结构特征。结果发现,双金属PdNi基催化剂可以实现丁炔二醇的完全转化。对于产物丁二醇的选择性,还原法制备的PdNi/CNTs仅达60.6%,而浸渍法制备PdNi/α-Al2O3和PdNi/CNTs则可达89.1%和98.9%。X射线衍射（XRD）、氢气程序升温还原（H2-TPR）及透射电镜（TEM）等表征结果表明,具有合适相互作用、合金形式（部分）以及高度分散的Pd-Ni物种对丁炔二醇加氢具有重要作用,有利于反应中间产物丁烯二醇进一步加氢至丁二醇。而CNTs具有较优的储氢能力,以CNTs为载体有利于提高PdNi基催化剂表面的氢浓度,进而促进丁烯二醇加氢。中央高校基本科研业务费专项(20720170029

1,4-丁炔二醇温和条件下Pd-Ni基加氢催化剂的研究

鉴于1,4-丁炔二醇加氢制1,4-丁二醇的生产工艺一般涉及高压高温,分别以α-Al2O3和碳纳米管(CNTs)为载体,研究了近室温(30℃)近常压(0.2MPa)下1,4-丁炔二醇的Pd(Ni)基催化剂的加氢性能及其结构特征.结果发现,Pd-Ni双金属催化剂可以实现1,4-丁炔二醇的完全转化.对于产物1,4-丁二醇的选择性,还原法制备的1%Pd-1%Ni/CNTs仅达60.6%,而分步浸渍法制备的1%Pd-1%Ni/α-Al2O3和1%Pd-1%Ni/CNTs则分别达到89.1%和98.9%.X射线衍射(XRD)、氢气程序升温还原(H2-TPR)及透射电镜(TEM)等表征结果表明:具有合适相互作用、合金形式(部分)以及高度分散的Pd-Ni物种对1,4-丁炔二醇加氢具有重要作用,有利于反应中间产物1,4-丁烯二醇进一步加氢至1,4-丁二醇;且CNTs具有较优的储氢能力,以CNTs为载体有利于提高Pd-Ni基催化剂表面的氢浓度,进而促进1,4-丁烯二醇加氢.中央高校基本科研业务费专项(20720170029

Ag/CeZrO催化剂中Ag的负载量对碳烟燃烧活性的影响

开发低温下高催化活性的柴油机碳烟颗粒燃烧催化剂是当前环境催化领域的热点问题。利用共沉淀的方法制备了用于碳烟催化燃烧反应的Ag/CeZrO催化剂。活性评价结果表明,相对于CeZrO催化剂,Ag的引入可显著降低碳烟催化燃烧温度。而且,Ag的负载量存在一个最佳值。以XRD、in-situ XRD、BET、TPR等表征手段探究了该系列催化剂结构性质及其变化产生的影响。结果表明,Ag与Ce物种间的相互作用可显著降低催化剂（特别是CeO表面氧）的还原温度。该相互作用使Ag/CeZrO催化剂在一定温度下（>200℃）就表现出Ag的性质。这些性质与该催化剂具有较高的碳烟氧化活性相关。而且,该催化剂也表现出良好的稳定性。国家自然科学基金项目(21303140,21673187)；中央高校基本科研业务费专项资金项目(20720170029)~~

Investigating the demand for barrier-free information by visually impaired people for the design of a social platform facilitating the sharing of this information

Assistive instruments such as slopes and textured paving blocks are installed in order to help the elderly, visually impaired, and physically impaired, who face many inconveniences in moving around outside. Though these precipitous situations affect disabled people’s migration pathways in getting to their destinations, it is difficult to quickly gain new knowledge on barrier-free pathways because of limited local information disclosure. It is necessary to develop a comprehensive system that appropriately acquires and arranges scattered barrier-free information and presents that information intuitively. Our study aims at developing a social platform that can obtain and present information depending on users’ situations, including users’ disabilities and locations, and can share barrier-free information provided by users. This report outlines the concept design, the implementation progress of the platform, and the results of a needs survey of visually impaired people.departmental bulletin pape