石墨剂对制造用于丙烯直接氧化成丙烯酸的 MoVTeNbO 催化剂的物理化学影响

IF 1.8 4区 工程技术 Q3 Chemical Engineering
Hossein Khosravi Rouzbahani, Azam Akbari, Golshan Mazloom
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引用次数: 0

摘要

MoV 基复合材料是最有前途的潜在催化剂,可用于从烷烃/烯烃物质直接生产丙烯酸。本文合成了 MoVTeNbO 粉末,并通过添加石墨作为适当的压片剂成功制成。如果不使用石墨作为润滑剂,则无法制作片剂。通过 X 射线衍射 (XRD)、Brunauer-Emmett-Teller (BET)、扫描电子显微镜 (SEM)、氨温程控解吸 (NH3-TPD) 和热重分析 (TGA) 等方法研究了石墨对催化剂性能的物理化学影响。与裸粉末相比,TGA 结果表明,石墨不仅易于形成片剂,而且操作简便。通过 XRD 和 SEM 分析,没有发现石墨对催化剂晶相和形态造成有害影响。扫描电子显微镜图像证明,在压缩过程中,石墨是催化剂颗粒物理结合的粘合剂,从而产生了理想的物理阻力。石墨导致 BET 表面积和最终催化剂酸度略有下降。尽管会降低丙烯的转化率,但有趣的是,通过压片,丙烯酸的产率得到了大幅提高。石墨作为一种惰性剂,抑制了催化剂表面的热点,从而使催化剂的活性长期保持优异的一致性,并降低了对不良 COx 的选择性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Physicochemical influence of graphite agent for fabrication of MoVTeNbO catalyst for direct oxidation of propene to acrylic acid
MoV‐based composites stand out as the most promising potential catalysts targeted for direct production of acrylic acid from alkane/alkene substances. Herein, MoVTeNbO powder was synthesized and successfully fabricated by adding graphite as an appropriate tableting agent. Without employing graphite as lubricant, the fabrication of tablets was not practicable. The physicochemical effects of graphite on the catalyst properties were investigated via characterization by X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), ammonia temperature‐programmed desorption (NH3‐TPD), and thermal gravimetric analysis (TGA) methods. In addition to the easy and operative formation of tablets by consisting graphite, TGA results indicated better thermal stability compared to the bare powder. No harmful impact of graphite on the catalyst crystalline phases and morphology was detected by XRD and SEM analysis. The SEM images proved the graphite incorporation as a binder in the physical combination of the catalyst particles along the compression process, resulting in the desired physical resistance. Graphite caused a slight decrease in the BET surface area and final catalyst acidity. Despite the effect of reducing propene conversion, interestingly, a substantial improvement in the yield of acrylic acid was found by tableting. The graphite as an inert agent suppressed hot spots on the catalyst surface, leading to superior consistency in activity over time as well as lower selectivity to undesirable COx.
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来源期刊
Asia-Pacific Journal of Chemical Engineering
Asia-Pacific Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
3.50
自引率
11.10%
发文量
111
审稿时长
2.8 months
期刊介绍: Asia-Pacific Journal of Chemical Engineering is aimed at capturing current developments and initiatives in chemical engineering related and specialised areas. Publishing six issues each year, the journal showcases innovative technological developments, providing an opportunity for technology transfer and collaboration. Asia-Pacific Journal of Chemical Engineering will focus particular attention on the key areas of: Process Application (separation, polymer, catalysis, nanotechnology, electrochemistry, nuclear technology); Energy and Environmental Technology (materials for energy storage and conversion, coal gasification, gas liquefaction, air pollution control, water treatment, waste utilization and management, nuclear waste remediation); and Biochemical Engineering (including targeted drug delivery applications).
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