The Structure and Catalytic Properties of MoVTeNbO Catalysts Modified by Adding Cr, Fe, Ce and W

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL
Shuangming Li, Zixuan Lu, Yunong Yan, Luyao Deng, Yaoxin Fan, Ning Zhu, Leilei Xu, Sansan Yu
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Abstract

Cr, Fe, Ce and W doped MoVTeNbO M2 phase catalysts were synthesized and used in the selective oxidation of propylene to acrylic acid (AA). Results show that the introduction of Cr, Fe, Ce and W substantially affects the physicochemical properties and catalytic performance of MoVTeNbO-based catalysts. Un-doped catalyst consists of M2 phase and TeO2, while Cr, Fe, Ce and W-doped catalysts are mainly composed of M2 and MoO3. It is indicated that doping of Cr, Fe, Ce and W can restrain the formation of TeO2, but favour the formation of MoO3. Un-doped, Cr and W-doped catalysts display irregular-shaped particles morphology, while Fe and Ce-doped catalysts display nanosheets morphology. In addition, the valence of superficial elements of catalysts changed greatly with the doping elements. For catalytic performance, in addition to Cr, the propylene conversion of the catalyst decreases obviously with doping of other elements, probably due to the drastically reduced specific surface area with doping of Fe, Ce and W. The existence of Cr and Ce can increase the selectivity to AA at all test temperatures (360–440 ℃), while Fe and W-doped catalysts only show higher selectivity than the un-doped one at high temperature of 420 and 440 ℃. It is illustrated that the catalysts with redox ability at relatively low temperature is more favorable for the selectivity to AA. Among them, Cr-doped catalyst shows the highest selectivity (85.3%) and yield (63.5%) of AA at test temperature of 380 ℃, which are 15.3 and 7.5% higher than that of un-doped catalyst, respectively.

Graphic Abstract

The M2 phase MoVTeNbO catalysts doped with Cr, Fe, Ce and W have been synthesized. It is demonstrated that the addition of Cr improves the stability of Te4+, and Cr-doped M2 phase shows excellent catalytic performance in the selective oxidation of propylene to acrylic acid.

Cr、Fe、Ce和W改性MoVTeNbO催化剂的结构和催化性能
合成了Cr、Fe、Ce和W掺杂的MoVTeNbO M2相催化剂,并将其用于丙烯选择性氧化制丙烯酸(AA)。结果表明,Cr、Fe、Ce和W的引入对movtenbo基催化剂的理化性质和催化性能有较大影响。未掺杂催化剂主要由M2相和TeO2组成,而Cr、Fe、Ce和w掺杂催化剂主要由M2相和MoO3组成。结果表明,Cr、Fe、Ce和W的掺杂抑制了TeO2的形成,但有利于MoO3的形成。未掺杂、Cr和w掺杂的催化剂表现为不规则形状的颗粒形态,而Fe和ce掺杂的催化剂表现为纳米片形态。此外,随着元素的掺杂,催化剂表面元素的价态发生了很大的变化。在催化性能方面,除Cr外,其他元素掺杂后催化剂的丙烯转化率明显降低,这可能是由于Fe、Ce和w的掺杂大大降低了比表面积。在360 ~ 440℃的所有测试温度下,Cr和Ce的存在都能提高对AA的选择性,而Fe和w掺杂的催化剂仅在420和440℃的高温下表现出比未掺杂的催化剂更高的选择性。结果表明,在较低温度下具有氧化还原能力的催化剂对AA的选择性更有利。其中,在380℃的测试温度下,cr掺杂催化剂对AA的选择性最高(85.3%),产率最高(63.5%),分别比未掺杂催化剂高15.3%和7.5%。摘要合成了掺杂Cr、Fe、Ce和W的M2相MoVTeNbO催化剂。结果表明,Cr的加入提高了Te4+的稳定性,并且Cr掺杂的M2相在丙烯选择性氧化制丙烯酸中表现出优异的催化性能。
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来源期刊
Catalysis Surveys from Asia
Catalysis Surveys from Asia 化学-物理化学
CiteScore
4.80
自引率
0.00%
发文量
29
审稿时长
>12 weeks
期刊介绍: Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.
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