a co 2 Catalyst for directly producing low-carbon olefins by hydrogenation and preparation method thereof
A low-carbon olefin and catalyst technology, applied in the field of catalyst and its preparation, can solve the problems of poor catalyst stability, reduced olefin selectivity, and high selectivity of by-products
Active Publication Date: 2020-10-23
NINGXIA UNIVERSITY
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Considering that Fe-based catalysts are cheap and easy to obtain, and have good catalytic activity, they are widely used in carbon dioxide hydrogenation reactions, but there are still problems such as wide product distribution and poor catalyst stability.
In a typical Fischer-Tropsch synthesis reaction, primary olefins are easily re-adsorbed on the catalyst surface to trigger a secondary hydrogenation reaction, resulting in a decrease in the selectivity of olefins, which is one of the main factors affecting the high selectivity of by-products in this process.
At present, there are still key technical problems in inhibiting the secondary reaction activity of primary olefins, improving the olefin selectivity of catalysts, reducing CO selectivity, and regulating product distribution.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] 1. Catalyst preparation
[0026] (1) Synthesis of mixed oxides by calcination method
[0027] with K 2 CO 3 (KNO 3 ), Fe(NO 3 ) 3 9H 2 O, TiO 2 Samples of different masses were weighed and mixed in a mortar for the raw materials according to a certain ratio, and then fully ground and roasted at 500 °C for 3 h. The roasted samples were ground evenly.
[0028] (2) Preparation of layered K–Fe–Ti catalysts by high-temperature solid-state method
[0029] Take (1) 2 g of the powder sample obtained after calcination, and keep the gas flow rate at 50 mL min in the air atmosphere –1 , after thorough grinding in a tube furnace (15 °C–500 °C, 5 °C / min; 500 °C–800 °C, 10 °C / min; 800 °C–1000 °C, 5 °C / min; 1000 °C–1100 °C, 2 °C / min) were calcined at 1100 °C for 10 h, and cooled naturally. The roasted samples were ground evenly.
[0030] 2. Catalyst Characterization
[0031] According to the XRD characterization test, the catalyst sample has layered characteristic diffra...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
This invention relates to CO 2 A layered structure catalyst for directly producing ethylene, propylene and butene through hydrogenation. The catalyst of the present invention is prepared by mixing ferric nitrate nonahydrate, potassium carbonate, and titanium dioxide under certain conditions, and then calcining twice at a certain temperature using a high-temperature solid phase method to prepare a catalyst with a layered structure. The catalyst of the present invention has a stable layered structure and can 2 The layered structure can be stably maintained before and after hydrogenation to directly produce ethylene, propylene, and butene, which inhibits the secondary olefin reaction caused by the re-adsorption of primary olefins to a certain extent. 2 High olefin selectivity is achieved by direct hydrogenation to light olefins. The preparation method is simple, environmentally friendly and has potential application value.
Description
technical field [0001] The present invention relates to CO 2 Catalyst for highly selective hydrogenation synthesis of ethylene, propylene, butene and preparation method thereof, specifically relates to a metal composite oxide catalyst with a stable layered structure for use in CO 2 Catalyst for hydrogenation of ethylene, propylene, butene and its preparation. Background technique [0002] CO 2 Hydrogenation to light olefins is the current CO 2 One of the potential ways to utilize this process can be through the CO 2 Fischer-Tropsch synthesis process (CO 2 –FTS) to selectively synthesize light olefins. This process activates and stabilizes CO 2 At the same time, it can realize its high added value utilization, which will be of great significance in scientific research and practical application. Since the product of the Fischer-Tropsch process is limited by the (Anderson-Schulz-Flory) ASF distribution, its product distribution is relatively wide, and the product alkane ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J37/08C07C1/12C07C11/04C07C11/06C07C11/08
CPCC07C1/12B01J23/002B01J23/78B01J37/08C07C2523/78B01J2523/00B01J35/30B01J2523/13B01J2523/47B01J2523/842C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 张建利王旭赵天生高新华马清祥范素兵
Owner NINGXIA UNIVERSITY