diff --git a/inbox-excel-vocabs/voc4cat.xlsx b/inbox-excel-vocabs/voc4cat.xlsx
deleted file mode 100644
index 0ab65c3..0000000
Binary files a/inbox-excel-vocabs/voc4cat.xlsx and /dev/null differ
diff --git a/vocabularies/voc4cat/0000025.ttl b/vocabularies/voc4cat/0000025.ttl
index fe8aebc..a8f508d 100644
--- a/vocabularies/voc4cat/0000025.ttl
+++ b/vocabularies/voc4cat/0000025.ttl
@@ -5,10 +5,10 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
 <https://w3id.org/nfdi4cat/voc4cat_0000025>
     a skos:Concept ;
     dcterms:identifier "voc4cat_0000025"^^xsd:token ;
+    skos:broader <https://w3id.org/nfdi4cat/voc4cat_0000186> ;
     skos:definition "The material that the substrate is made of. Common materials include: glass (conductive or not), ceramics and metal."@en ;
     skos:historyNote "0000-0002-6242-2167 Nikolaos G. Moustakas created the resource"@en ;
     skos:inScheme <https://w3id.org/nfdi4cat/voc4cat_> ;
     skos:prefLabel "substrate material"@en ;
-    skos:topConceptOf <https://w3id.org/nfdi4cat/voc4cat_> ;
 .
 
diff --git a/vocabularies/voc4cat/0000158.ttl b/vocabularies/voc4cat/0000158.ttl
index e342d51..d0ec71c 100644
--- a/vocabularies/voc4cat/0000158.ttl
+++ b/vocabularies/voc4cat/0000158.ttl
@@ -5,10 +5,10 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
 <https://w3id.org/nfdi4cat/voc4cat_0000158>
     a skos:Concept ;
     dcterms:identifier "voc4cat_0000158"^^xsd:token ;
+    skos:broader <https://w3id.org/nfdi4cat/voc4cat_0000186> ;
     skos:definition "Material that the optical window is made of. The window, usually attached to the lid sealing the reaction chamber, allows the incoming light to interact with the catalyst. The material of the window influences the wavelength range that the catalyst experiences."@en ;
     skos:historyNote "0000-0002-6242-2167 Nikolaos G. Moustakas created the resource"@en ;
     skos:inScheme <https://w3id.org/nfdi4cat/voc4cat_> ;
     skos:prefLabel "optical window material"@en ;
-    skos:topConceptOf <https://w3id.org/nfdi4cat/voc4cat_> ;
 .
 
diff --git a/vocabularies/voc4cat/0000186.ttl b/vocabularies/voc4cat/0000186.ttl
index 31c46d6..c2ebd93 100644
--- a/vocabularies/voc4cat/0000186.ttl
+++ b/vocabularies/voc4cat/0000186.ttl
@@ -17,6 +17,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
         <https://w3id.org/nfdi4cat/voc4cat_0000013> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000016> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000018> ,
+        <https://w3id.org/nfdi4cat/voc4cat_0000025> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000033> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000037> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000039> ,
@@ -55,6 +56,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
         <https://w3id.org/nfdi4cat/voc4cat_0000154> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000155> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000156> ,
+        <https://w3id.org/nfdi4cat/voc4cat_0000158> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000159> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000162> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000170> ,
diff --git a/vocabularies/voc4cat/concept_scheme.ttl b/vocabularies/voc4cat/concept_scheme.ttl
index 2b4a1eb..c90f5f0 100644
--- a/vocabularies/voc4cat/concept_scheme.ttl
+++ b/vocabularies/voc4cat/concept_scheme.ttl
@@ -17,8 +17,6 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
     owl:versionInfo "automatic" ;
     skos:definition "A vocabulary for all areas of catalysis initiated in NFDI4Cat. Starting with photocatalysis we add more and more terms from other areas of catalysis and related disciplines like chemical engineering or materials science."@en ;
     skos:hasTopConcept
-        <https://w3id.org/nfdi4cat/voc4cat_0000025> ,
-        <https://w3id.org/nfdi4cat/voc4cat_0000158> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000180> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000181> ,
         <https://w3id.org/nfdi4cat/voc4cat_0000182> ,