Molybdenum-Bismuth Oxide Catalyst Preparation Without Ammonia and NOx
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Solution Overview
Problem
Existing methods for preparing molybdenum-bismuth-based composite metal oxide catalysts generate significant amounts of ammonia and NOx substances, leading to equipment corrosion and occupational hazards.
Innovation Solution
A method involving the use of oxide or hydrate forms of molybdenum, bismuth, and additional metal compounds, such as W, Sb, As, P, Sn, Pb, Fe, Zn, Cr, Mn, Cu, Pd, Ag, Ru, Co, Cd, Ta, Pt, Ni, Al, Zr, V, Ce, Se, Ga, Ti, Ge, Rh, and Au, to minimize nitric acid and ammonia generation during catalyst preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nitric acid salts or ammonium salts are used as precursor compounds in the co-precipitation method, then the molybdenum-bismuth-based composite metal oxide catalyst can be prepared, but significant amounts of ammonia and NOx substances are generated causing equipment corrosion and occupational hazards
Solution Approach 1:
The invention changes the chemical form of the precursor compounds from nitric acid salts and ammonium salts to carbonate salts. This parameter change in the precursor composition eliminates the generation of ammonia and NOx during the preparation process, while still enabling the formation of the desired molybdenum-bismuth-based composite metal oxide catalyst through calcination.
Solution Approach 2:
The invention uses readily available carbonate salts (such as ammonium carbonate, bicarbonate, or carbonate) as precursor compounds that decompose completely during calcination to form the catalyst, leaving no harmful residues. These precursor compounds are consumed in the process and replaced with environmentally benign alternatives.
2Ease of manufacture
If nitric acid salts or ammonium salts are used as precursor compounds, then the catalyst can be prepared through co-precipitation, but equipment corrosion and occupational exposure risks increase
Solution Approach 1:
The invention changes the precursor compound type from corrosive nitric acid salts and ammonium salts to non-corrosive carbonate salts. This parameter change eliminates equipment corrosion issues and occupational exposure risks while maintaining the effectiveness of the co-precipitation method for catalyst preparation.
3Productivity
If conventional precursor compounds are used, then the catalyst synthesis process is established, but environmental issues arise from ammonia and NOx discharge
Solution Approach 1:
The invention changes the chemical composition parameter of the precursor compounds from nitrogen-containing nitric acid salts and ammonium salts to carbonate-based precursors. This change eliminates harmful ammonia and NOx emissions during catalyst production, resolving the environmental pollution issue while maintaining productive catalyst synthesis.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces the generation of hazardous substances like nitric acid and ammonia, while maintaining superior catalyst performance for the production of (meth)acrolein and (meth)acrylic acid.
Implementation Method 1
drying the catalyst suspension
Data Source
AI summary
A method for preparing a molybdenum-bismuth-based composite metal oxide.